Draft-controller for smoke-conduits



L. W. HOWARD. DRAFT CONTROLLER FOR SMOKE CONDUITS.

APPLICATION FILED OCT. 7, I918.

Patented J an. 20, 1920.

aw LawrenceW Howard Moz LAWRENCE \V. HOWARD, OF MANCHESTER, NEXVHAMISHIEE.

DRAFT-CONTROLLER FOR SMOKE-OONDUITS.

Application filed October 7', 1918.

To all whom it may concern Be it known that I, LAWRENCE How- .xun, acitizen of the United States, residing at Manchester, Hillsboroughcounty, and State of New Hampshire, have invented and discovered certainnew and useful Improvements in Draft-Controllers for Smoke-Coir duits,of which the following is a specification.

My said invention consists in an improved construction of dampers, ordraft controllers, for the smoke fines or stacks of stoves, furnaces,etc, whereby the draft may not only be controlled, but a largepercentage of the heat which commonly is wasted may be conserved andutilized, the fire controlled, and congestion in the smoke pipe or flueavoided, resulting in a material saving of fuel, all as will be morefully pointed out in the claims.

Referring to the accompanying drawings which are made a part hereof andon which similar reference characters indicate similar parts,

Figure 1 is a perspective view of section of a smoke pipe, or flue,provided with a draft controller of my improved construction, the shellof the flue being broken away to illustrate the construction and arrangement of parts more clearly; and

Fig. 2, a central sectional view through the same.

In said drawings the portion marked A represents the shell of the flue,B the body of the draft controller, and C the damper or valve.

The smoke pipe or flue may be of the form illustrated, or of any formdesired, either round, square, or of other cross-sectional shape, andcomposed of iron, brick, or masonry as may be desired.

The draft controller comprises a tubular member or body B having a baseflange of flexible material, such as sheet iron, secured to its lowerend, and having cut out or recessed portions between pro ecting arms 10,which arms are adapted to impinge against the walls of the smoke pipe orstack as shown. By bending these arms 10 more or less, the draftcontroller is adapted to fit smoke pipes or smoke stacks of varioussizes, as will be readily understood. The body member B is preferablytapered slightly, as shown, and has the damper C mounted on a. rod 11which extends through the upper end of said body B and an angular socketSpecification of Letters Patent.

Patented Jan. 20, 1920.

Serial No. 257,193.

12 formed on said damper and also through perforations in the sides ofthe pipe, and has a handle 13 on its outer end by which it may be turnedor adjusted.

It is well known that the hotter part of the products of combustion goout through the smoke pipe or stack at the center, and that the outerportions of the body of said products of combustion are the coolerportions. In operation, by closing the damper C after the fire isstarted, the central portion of the smoke stack is closed and the heatcontained in the products of combustion retarded and deflected to theouter part of the smoke stack and compelled to pass through the recessesor cut out portions between the arms 10 of the flange, with resultantincreased heat radiation; It has been found in actual operation thatafter the fire is started, the damper C may be completely closed and afire maintained in satisfactory condition for a long period of time.here the capacity of the smoke stack is too greatly restricted by thecomplete closure of the damper, however, it can be regulated to leave asmuch or as little of the space open as required for the purpose ofsecuring the most favorable results.

By the use of this device, a complete combustion of all gases and coalmay be secured, thus saving practically all of the heat units in thefuel and preventing their escape through the flue, and also avoidingcongestion in the smoke pipe. In burning wood, it has been found thatthe damper C may be kept closed even while the fire is being started.

Having thus fully described my said invention, what I claim as new anddesire to secure by Letters Patent is:

l. A draft and smoke controller comprising in combination with a smokeconduit a restricting tapering member coaxial with the conduit, a plateextending outwardly from the base of the conical member perpendicular toits axis, smoke passages cut from the periphery of the plate formingresilient fingers bearing against the interior of the conduit, and meanspositioned within the conical member for further restricting the passagetherethrough.

2. A draft and smoke controlling mechanism comprising in combinationwith a smoke conduit a tapered member, a supporting plate perpendicularto the axis of the supporting member, smoke mssages cut from theperiphery of the supporting plate, I lzunpshire, this 3rd day of 0012.,A. D. ninea-nd e sepond supporting member passing teen hundred andeighteen.

throu h t 1e conical member at the end 0 0- r site tlie plate andprovided With a dan lger LAWRENCE HOWARD disposed Within the smallerend. Witnesses:

In Witness whereof, I have hereunto set IRVING E. FORBES,

my hand and seal at Manchester, New lVILLIAM W. FORBES.

